when a waterstone gets too thin...

... do you mount it on a wood or plastic board so it doesn't crack,
and if so, how?
For a not-to-be-immersed stone my guess would be tile mastic on wood
because the adhesive is rigid but sticks to porous stuff. How about
stones that stay wet?

For sword polishing, some of my waterstones are sawn into very thin
slices, then used by placing them on a springy wooden fingerboard.
Some people glue them, some don't. I find that a coarse bandsaw blade
leaves a rough enough finish on larch to not need it.
Many waterstones (particularly hard/fine polishing stones) are
permanently mounted onto wooden stands. A hot hide glue & resin mix
was traditional, or you can use silicone these days. If you want to
take them off later, silicone can be sawn through with a bit of
fishing line and toggle handles.

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